Molding-machine



Patented June 15; 1920.

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JULIUS E. BOMBERG, F DETROIT, MICHIGAN.

MOLDING-MACHINE.

Specification of Letters Patent. PatentedJ 11116 15, 1920.

Application filed February 14, 1919. Serial No. 276,931.

3 To all whom it may concern:

Be it known that I, JULIUS E. BOMBERG, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Molding-Machines, of which the following is a specification, reference being had therein to the accompanying drawings. I

The invention relates to machines for forming molds and has for one of its objects the provision of an eflicient and'durable construction, in which the molding table is moved through an endless'circuit and comprises a series of pivotally connected plates. Another object of the invention is the provision of rotating means directly engaging the plates to move the table through an endless circuit; A further ob-l ject is the provision of means for automatically raising the mold flasks from the plates after'the molds have been formed. Other objects of the invention reside in the novel arrangements and combinations of parts as more fully hereinafter set forth.

In the drawingsy Figure 1 is' an end elevation of the construction embodying my invention with part of the molding table removed; 1

Fig. 2 is a side elevation thereof;

Fig. 3 is a central vertical longitudinal section therethrough.

The frame of the machine comprises thev base 1 having the standards 2 at its sides. 3 is the molding table for carrying the mold flasks, and 4 is the tamping mechanism. The moldingtable is. continuous and comprises the series of plates 5 pivotally connected to each 'otherat their side edges. These plates pass around and are mounted upon the pairs of disks 6 at the ends of the machine, the disks having each of their edges substantially equal to the width of the inner side of each plate. The disks engage the opposite ends of the plates, which are provided with inwardly-extending flanges 7 adapted to lie adjacent the inner sides of the disks and thereby prevent transverse movement of the plates relative to the disks.

For rotating the molding table 3, the following mechanism is provided: 8 is a power shaft mounted in the upper ends of the standards 2 and having at its ends suitable belt pulleys 9. The power shaft is provided with cranks 10 outside the standards 2, the

pins of which are connected to the upper ing the end of each dog into engagement with the teeth. Non-rotatably mounted upon opposite ends of the shaft 13 are the driving gears 17, the teeth of which mesh with the teeth upon gears 18, which are non-rotatably mounted upon shafts 19 on opposite ends of the base 1. The disks 6 are secured upon opposite ends of the shafts 19 and inside the base 1.

The tampingmech'anism 4 comprises the straps 20 upon the eccentrics 21, which eccentrics are non-rotatably mounted upon the power shaft 8. The straps 20 are longitudinally adjustable and, as shown, each comprises two parts, 22 and 23, adjust-ably secured to each other by means of the bolts 2 1, which engage in a longitudinal slot in the member 22. The lower end of the member 23 is pivotally secured to the plunger bar 25, which slidably engages at its opposite ends the vertical guide-ways 26 in the standards 2. Suitably mounted on the under surface of this plunger bar are the plungers 27 and 28 forforcing the material for forming the molds, such as molding sand, into the flasks upon the plates 5.

Patterns 29 are permanently secured toeach molding plate 5 and each molding plate is further provided with the pairs of guidepins 30 for receiving the cope and drag, 31

and 32 respectively, which form the cooperating parts of the'molding flask, the arrangement being such that the cope and drag surround their respective patterns. The plunger 27 is adapted to force the sand down into the cope 31 and the plungerv 28 is adapted to force the sand'into the drag 32, but in the latter case the bottom 33 for the drag is placed between the plunger 28 and drag so that the plunger contacts with this bottom and forces the latter against the molding sand. 7 7

With the construction as thus far described, upon power being applied to the power shaft 8, the latter will be rotated, thereby rocking the dogs 14 through the step motion These gears in ,turntransmit the motion to the disks 6 through the ma1n shaft 13, gears 17 and 18 and shafts 19.

' The dogs 14 are rocked a distance such that the disks 6 are rotated through one quarter of a revolution so that the molding table advances the distance of the Width of one plate at a time. The cope and drag 31 and 32 respectively are placed on the plate 5 at one end of the table and the molding material placed therein during the time the table is at rest. The table then advances .one plate and the ,plungers 27 and 28 move downwardlyto force the sand against and aroundthe patterns upon the plate. Meanwhile, another cope and drag are being placedupon the succeeding plate and filled with molding material. The table then advances anotherplate'and the cope and drag are ready to be removed at the opposite end of the table, and another plate is ready to receive another cope and drag with the molding material, the tamping mechanism meanwhile acting upon the. intermediate plate molds. I p

For automatically'raising the cope and drag when they'reach the removal end of the table, the following construction is provided: 34 is a cross bar extending between the standards 2 and underneath the upper plates 5 of the table, the ends'of this cross bar adapted to guide and support the plate thereabove when theplungers 27 and 28 move downward. 3,5 are longitudinally extending bars secured at one end to the cross bar 34 and mounted at their opposite ends upon the frame 36 which has bearings 37 engaging the shaft 19 at the removal end.

of the machine. 38 is a bifurcated rock bar centrally pivoted upon the member 39 depending, from the cross bar .40 secured to the bars 35. V The inner end of this rock bar is preferably recessed to receive the lower end of the vertically extending rod 41 which extends. up through an aperture in the cross bar 34 and terminates slightly below the lower surface of the plate 5 thereabove. The opposite end of the rock bar 38 has the furcations'42, the ends of which engage in the bar 43 extending transversely of the machine with sufficient play to permit of the relative movement between the furcation ends andvbar when the former are rocked.

7 extends across the frame 46. This frame is mounted upon'the inner side of each plate 5 and is free to move toward or from the same. Specifically brackets 47 are provided extending in from the plates and having lateral portions 48 extending across the frame 46 at points outside the H-shaped frame 45*. Pins 49 are adjustably secured in the frame 46 as by threadedly engaging the'same and slidably engage in apertures in the plates 5, the arrangement being such that the outer ends of these pins simultaneously engage a cope and a drag to raise the same from the plate'upon which they rest. The rod 50 is provided adjustably secured to the plunger bar 25 as by threadedly engaging the same, this rod being in alinement, with the vertically-extending rod 41. Theplates 5 each. have the hole 51 therethroughwhich is located so that it will be in alinement with the" rod 50 when its plate is under the plunger bar, thereby permitting the rod 50 to engage the rod 41 when the plunger bar 1 moves downwardly. This raises the stems 44 and their H-frames 45 which in turn move the frames 46 upwardly to lift the cope and drag. What I claim as my invention is: 1. In a molding machine, the combination with their pins 49 I with a. frame, of an endless series of plates connected plates engaging on said disks, 7

and means for rotating said shafts.

4. In a molding machine, they combination with a frame, shafts rotatably mounted in said frame, and disks non-rotatably secured to said shafts, of a table comprising a series of pivotally-connected plates extending around and engaging the edgesof said disks,

width of one of the said edges each being of a length substantially equal to the plates.

5. In a molding machine, the combination with a molding table, of a cope and drag mounted on the same side of said table, and a single plunger for simultaneously pressing the molding material into said cope and drag.

6. In a molding machine, the combination with a moldingtable carrying a flask, of

means for pressing the molding material into said flask, and means extending through said molding table for subsequently auto matically raising said flask from said table.

7 In a molding machine, the combination with a molding table carrying a plurality of mold flasks, of means for pressing the molding material into one of said flasks, and means operated by said first-mentioned means for raising another of said flasks from Said table.

8. In a molding machine, the combination with a molding table, comprising a series of pivotally connected plates, each adapted to carry a mold flask, of means carried on the inner sides of said plates movable therethrough into engagement with said mold,

flasks, means for pressing the molding material into one of said flasks, and means operated by said pressing means for actuating said first-mentioned means to separate a flask from its plate.

9. In a molding machine, the combination with a frame, of shafts rotatably mounted in said frame, disks non-rotatably secured to said shafts, a series of pivotally-connected plates engaging said disks, and flanges on said plates adapted to engage said disks for preventing the transverse movement of said plates relative to said disks.

10. In a molding machine, the combination with a frame, of a moldin table movable through an endless circuit and comprising a series of plates each adapted to carry a mold flask, means for pressing molding material into one of said mold flasks, and a cross bar on said frame beneath the plate on which said mold flask is mounted, said cross bar provided with means for supporting said plate.

11. In a molding machine, the combina-' tion with a rotatable shaft, of a polygonal member non-rotatably secured to said shaft, a series of pivotally connected plates engaging said polygonal member, and means for rotating said shaft..

12. In a molding machine, the combination with a frame, of a continuous molding table movably mounted thereon, a plurality of molding flask sections adapted to be mounted thereon and conveyed thereby, and means for simultaneously pressing the molding material into said sections at one point in their travel.

In testimony whereof I aflix my signature.

JULIUS E. BOMBERG. 

